3.8 Coding System

Most countries use the ICD-10 coding system (12) to classify congenital anomalies (please refer to Chapter 5 for more information on coding). While countries can develop their own local coding system, WHO recommends the use of ICD-10 for international reporting and comparisons.

The remaining sections in this chapter describe case inclusion and exclusion criteria, procedures for data collection and components of a protocol for data collection.